Smaller pocket slide rule by Aristo from Germany. This is the model 815 Elektro and comes with:
- slide rule in great condition with only minimal signs of use / age
- it’s original Aristo signed leather pouch in great condition
- a manual in  German in great condition
- original cardboard outer box in little rougher condition (small piece missing, some tape)
The snug fitting box measures 21 cm or 8 1/4 inches, the rule itself measures ca. 16 cm or 6 1/4 inches long. See the attached video on how to work your vintage man tool : slide rule operation instructions!
